Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina

Recent studies proposed that distributive fluvial systems (DFS) occupy a great proportion in modern continental sedimentary basins, challenging classical sedimentary models proposed for similar ancient basin. Because of this, arises the importance of studying modern DFS with the aim of obtaining fac...

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Autores principales: Santi Malnis, P., Colombi, C.E., Rodríguez Posatini, N., Rothis, L.M., Limarino, C.O.
Formato: JOUR
Materias:
DFS
Intermontane basin
Seasonal climate
Western Pampean Ranges
arid region
braided river
catchment
drainage basin
floodplain
fluvial geomorphology
intermontane basin
meander
morphometry
piedmont
playa
sedimentary basin
sedimentology
Argentina
Guerrero
Mexico [North America]
Papagayo River
San Juan [Argentina]
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07187092_v45_n2_p186_SantiMalnis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07187092_v45_n2_p186_SantiMalnis
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spelling todo:paper_07187092_v45_n2_p186_SantiMalnis2023-10-03T15:36:46Z Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina Santi Malnis, P. Colombi, C.E. Rodríguez Posatini, N. Rothis, L.M. Limarino, C.O. DFS Intermontane basin Seasonal climate Western Pampean Ranges arid region braided river catchment drainage basin floodplain fluvial geomorphology intermontane basin meander morphometry piedmont playa sedimentary basin sedimentology Argentina Guerrero Mexico [North America] Papagayo River San Juan [Argentina] Sierras Pampeanas Recent studies proposed that distributive fluvial systems (DFS) occupy a great proportion in modern continental sedimentary basins, challenging classical sedimentary models proposed for similar ancient basin. Because of this, arises the importance of studying modern DFS with the aim of obtaining facial models to apply them in ancient deposits. In this paper, we analyze and discuss the sedimentary environments included in the modern deposits of the Arroyo Papagayos, Western Pampean Ranges, San Juan province, interpreted as a Distributive Fluvial System (DFS). We perform the study of the Papagayos creek by describing different architectural elements, which characterize the sub-environments organized in four zones from the mountain front to the distal playa lake. A low sinuosity gravelly-sandy bed braided fluvial system, characterizes the proximal zone. A medial to high sinuosity sandy-gravelly anastomosed-anabranching fluvial system describes the medial zone, where floodplain aggradation is domain by crevasse splays accretion. At this point, 10 km far from the mountain front, the deposits starts to develop a cone shaped morphology. A higher sinuosity flashy ephemeral meandering sandy-muddy fluvial system with eolian interaction defines the distal zone, where the main channel of the system disappears by low gradient of the topography and infiltration depositing muddy terminal splays. Finally, eolian dune and wet interdune deposits characterizes the fourth zone, interpreted as a transitional area between the DFS and the saline playa lake. A particular feature observed along the DFS system is that mudflows are the main sedimentary process in the floodplain, probably as the result of the combination of the seasonal arid climate and the Arroyo Papagayos drainage basin morphometry and the low gradient of the topography. The sedimentary process and environments recognized along the Arroyo Papagayos will allow a better understanding of arid DFS depositional dynamics as well as, to identify them in the geological record. Lastly, high aggrading conditions for DFS development will response to climate interaction between upland catchment area (semiarid) and valley (arid), drainage basin morphometry, smooth piedmont gradient and high tectonic subsidence of the basin, located in the Andean broken foreland. © 2018, Servicio Nacional de Geologia y Mineria. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07187092_v45_n2_p186_SantiMalnis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic DFS
Intermontane basin
Seasonal climate
Western Pampean Ranges
arid region
braided river
catchment
drainage basin
floodplain
fluvial geomorphology
intermontane basin
meander
morphometry
piedmont
playa
sedimentary basin
sedimentology
Argentina
Guerrero
Mexico [North America]
Papagayo River
San Juan [Argentina]
Sierras Pampeanas
spellingShingle DFS
Intermontane basin
Seasonal climate
Western Pampean Ranges
arid region
braided river
catchment
drainage basin
floodplain
fluvial geomorphology
intermontane basin
meander
morphometry
piedmont
playa
sedimentary basin
sedimentology
Argentina
Guerrero
Mexico [North America]
Papagayo River
San Juan [Argentina]
Sierras Pampeanas
Santi Malnis, P.
Colombi, C.E.
Rodríguez Posatini, N.
Rothis, L.M.
Limarino, C.O.
Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
topic_facet DFS
Intermontane basin
Seasonal climate
Western Pampean Ranges
arid region
braided river
catchment
drainage basin
floodplain
fluvial geomorphology
intermontane basin
meander
morphometry
piedmont
playa
sedimentary basin
sedimentology
Argentina
Guerrero
Mexico [North America]
Papagayo River
San Juan [Argentina]
Sierras Pampeanas
description Recent studies proposed that distributive fluvial systems (DFS) occupy a great proportion in modern continental sedimentary basins, challenging classical sedimentary models proposed for similar ancient basin. Because of this, arises the importance of studying modern DFS with the aim of obtaining facial models to apply them in ancient deposits. In this paper, we analyze and discuss the sedimentary environments included in the modern deposits of the Arroyo Papagayos, Western Pampean Ranges, San Juan province, interpreted as a Distributive Fluvial System (DFS). We perform the study of the Papagayos creek by describing different architectural elements, which characterize the sub-environments organized in four zones from the mountain front to the distal playa lake. A low sinuosity gravelly-sandy bed braided fluvial system, characterizes the proximal zone. A medial to high sinuosity sandy-gravelly anastomosed-anabranching fluvial system describes the medial zone, where floodplain aggradation is domain by crevasse splays accretion. At this point, 10 km far from the mountain front, the deposits starts to develop a cone shaped morphology. A higher sinuosity flashy ephemeral meandering sandy-muddy fluvial system with eolian interaction defines the distal zone, where the main channel of the system disappears by low gradient of the topography and infiltration depositing muddy terminal splays. Finally, eolian dune and wet interdune deposits characterizes the fourth zone, interpreted as a transitional area between the DFS and the saline playa lake. A particular feature observed along the DFS system is that mudflows are the main sedimentary process in the floodplain, probably as the result of the combination of the seasonal arid climate and the Arroyo Papagayos drainage basin morphometry and the low gradient of the topography. The sedimentary process and environments recognized along the Arroyo Papagayos will allow a better understanding of arid DFS depositional dynamics as well as, to identify them in the geological record. Lastly, high aggrading conditions for DFS development will response to climate interaction between upland catchment area (semiarid) and valley (arid), drainage basin morphometry, smooth piedmont gradient and high tectonic subsidence of the basin, located in the Andean broken foreland. © 2018, Servicio Nacional de Geologia y Mineria. All rights reserved.
format JOUR
author Santi Malnis, P.
Colombi, C.E.
Rodríguez Posatini, N.
Rothis, L.M.
Limarino, C.O.
author_facet Santi Malnis, P.
Colombi, C.E.
Rodríguez Posatini, N.
Rothis, L.M.
Limarino, C.O.
author_sort Santi Malnis, P.
title Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
title_short Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
title_full Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
title_fullStr Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
title_full_unstemmed Sedimentological characterization of a distributive fluvial system of arid climates: Arroyo Papagayos, eastern piedmont of La Huerta-Las Imanas Ranges, San Juan, Argentina
title_sort sedimentological characterization of a distributive fluvial system of arid climates: arroyo papagayos, eastern piedmont of la huerta-las imanas ranges, san juan, argentina
url http://hdl.handle.net/20.500.12110/paper_07187092_v45_n2_p186_SantiMalnis
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